The following are guidelines from Carl Pruitt, manager of technical training at John Bean Automotive Equipment, for properly mounting and demounting tires to avoid damaging expensive custom wheels:
1. Break down the inside bead last. That way it won't reseat when you break the outside bead. This applies to negative offset wheels which are the most common on today's vehicles.
2. Always clamp alloy wheels from the outside to prevent damaging the clear coat.
3. Use pneumatic power roller or tire tool to push the bead down so you can get plenty of lube on the tire bead and the rim drop down lip. The area 180 degrees from the mount/demount head should get well lubricated.
4. Lubricate the mount/demount head. Use the pneumatic roller or a tire tool to push down on the tire while positioning the mount/demount head. Use the Pneumatic roller or bead to hold down clamp, near the mount/demount head, if necessary to insert the tire tool.
5. When attempting to pull the tire over the mount/demount head make certain the tire is sliding into the drop center, 180 degrees from the mount/demount head.
6. Remove the tire tool before removing the beads. This will prevent the tire tool from scratching the rim as it slides off the mount/demount head. If a plastic or rubber sleeve is used on the tire tool it will not have to be removed.
Note: A plastic mount/demount head will greatly minimize the chance of damaging a rim. However, keep an extra on hand because they won't last forever. Typical cost is $25 to $30, which is a minimal investment to prevent damaging a $1,000 rim.
1. Check wheels and tires for correct size.
2. Lube both tire beads and the drop center lips of the rim. Lube the mount/demount head generously. Use a pneumatic bead hold down tool or a manual bead hold down tool to ensure that the bead moves into the wheel drop center during bead installation.
3. Remove clamps, lift wheel and move clamps all the way in, position the tire on the turn tables without clamping the wheel.
4. Use a safety restraint device on the tire and rim or position yourself a safe distance from the assembly during inflation in case of a bead failure.
5. Inflate to recommended pressure.